DOCUMENT:Q320829 11-JUN-2002 [winnt] TITLE :HOW TO: Modify the Default SizReqBuf Value in Windows 2000 PRODUCT :Microsoft Windows NT PROD/VER: OPER/SYS: KEYWORDS:kbAudITPro kbHOWTOmaster ====================================================================== IMPORTANT: This article contains information about modifying the registry. Before you modify the registry, make sure to back it up and make sure that you understand how to restore the registry if a problem occurs. For information about how to back up, restore, and edit the registry, click the following article number to view the article in the Microsoft Knowledge Base: Q256986 Description of the Microsoft Windows Registry IN THIS TASK ------------ - SUMMARY - How to Increase the SizReqBuf Value SUMMARY ======= This article describes how to modify the size of the SizReqBuf value. In File and Printer Sharing for Microsoft Networks, the SizReqBuf value determines how much data is buffered at one time to send to a client. The default values in Windows 2000 provide acceptable levels of performance in typical scenarios. However, on a high-latency connection, you may want to use an increased SizReqBuf value. By default, all Windows 2000 installations use a SizReqBuf value of 16,644 bytes. How to Increase the SizReqBuf Value ----------------------------------- WARNING: If you use Registry Editor incorrectly, you may cause serious problems that may require you to reinstall your operating system. Microsoft cannot guarantee that you can solve problems that result from using Registry Editor incorrectly. Use Registry Editor at your own risk. The SizReqBuf value is stored in the registry under the following registry key: HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\LanmanServer\Parameters The SizReqBuf value is a REG_DWORD value, with a range of from 512 to 65536. NOTE: Increasing the SizReqBuf value can increase performance significantly in a high-latency environment. However, note that increasing the SizReqBuf value also increases the non-paged pool memory that is used by the LanManServer service. If you increase the SizReqBuf value, make sure to monitor non-paged pool to make sure that the change does not affect the performance of the file server. Increasing the SizReqBuf value also proportionately increases the risk that a malicious user might use up non-paged pool on the file server. Additional query words: ====================================================================== Keywords : kbAudITPro kbHOWTOmaster Technology : kbOSWin2000 kbOSWinSearch Issue type : kbhowto ============================================================================= THE INFORMATION PROVIDED IN THE MICROSOFT KNOWLEDGE BASE IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND. MICROSOFT DISCLAIMS ALL WARRANTIES, EITHER EXPRESS OR IMPLIED, INCLUDING THE WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT SHALL MICROSOFT CORPORATION OR ITS SUPPLIERS BE LIABLE FOR ANY DAMAGES WHATSOEVER INCLUDING DIRECT, INDIRECT, INCIDENTAL, CONSEQUENTIAL, LOSS OF BUSINESS PROFITS OR SPECIAL DAMAGES, EVEN IF MICROSOFT CORPORATION OR ITS SUPPLIERS HAVE BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES. SOME STATES DO NOT ALLOW THE EXCLUSION OR LIMITATION OF LIABILITY FOR CONSEQUENTIAL OR INCIDENTAL DAMAGES SO THE FOREGOING LIMITATION MAY NOT APPLY. Copyright Microsoft Corporation 2002.